JPS59168620A - Die structure for injection molding in magnetic-field - Google Patents
Die structure for injection molding in magnetic-fieldInfo
- Publication number
- JPS59168620A JPS59168620A JP4202183A JP4202183A JPS59168620A JP S59168620 A JPS59168620 A JP S59168620A JP 4202183 A JP4202183 A JP 4202183A JP 4202183 A JP4202183 A JP 4202183A JP S59168620 A JPS59168620 A JP S59168620A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- yokes
- mold
- magnetizing
- yoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、多極異方性樹脂磁石の多数個取りを可能と
した磁場射出成形用金型構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold structure for magnetic field injection molding that enables the production of a large number of multipolar anisotropic resin magnets.
フェライト磁石粉末のような強磁性粉末を熱可塑性合成
樹脂（またはゴム）に混合し、所定形状に成形した後こ
れを着磁して等方性の樹脂磁石（またはゴム磁石）を製
造する方法は、既に広く知られ実用化されるに至ってい
る。近時、前記樹脂磁石の磁気特性を更に向」ニさせる
ために種々の研究がなされ、その研究の発展として、磁
石粉末の磁化容易軸を磁化方向に配向させて異方化する
技術の開発かなされている。この磁石を異方化する方法
としては、粒子に剪断応力を機械的に作用させたり、射
出成形金型に磁場を形成したりする方法があり、殊に後
者の方法が工業的に広〈実施化されている。There is a method for manufacturing isotropic resin magnets (or rubber magnets) by mixing ferromagnetic powder such as ferrite magnet powder with thermoplastic synthetic resin (or rubber), molding it into a predetermined shape, and then magnetizing it. , has already come to be widely known and put into practical use. Recently, various studies have been carried out to further improve the magnetic properties of the resin magnets, and as a development of this research, it is possible to develop a technology to orient the axis of easy magnetization of magnet powder in the direction of magnetization, thereby making it anisotropic. has been done. Methods for making this magnet anisotropic include mechanically applying shear stress to the particles and forming a magnetic field in an injection mold.The latter method is especially widely used in industry. has been made into
これば、磁気異方性定数の大きい強磁性粉末と合成樹脂
との混合物を加熱溶融し、この溶融混合物を磁場形成し
た金型のキャビティに射出して、磁石粉末粒子の磁化容
易軸を前記磁場の作用下に−・定方向に配向させて、磁
気特性の優れた異方性樹脂磁石を製造するというもので
ある。In this case, a mixture of a ferromagnetic powder with a large magnetic anisotropy constant and a synthetic resin is heated and melted, and this molten mixture is injected into a mold cavity in which a magnetic field is formed, so that the axis of easy magnetization of the magnet powder particles is aligned with the magnetic field. The method is to produce an anisotropic resin magnet with excellent magnetic properties by orienting it in a certain direction under the action of.
ところで、このいわゆる磁場射出成形により異方性樹脂
磁石を製造するに際して従来は、第１図に示すように、
金型に画成したキャビティ１０の半径方向外周に［ｌ極
の着磁ヨーク１２が列内的に配設されるが、磁界発生用
の励磁コイル１４は１つの着磁ヨークに対応的に１個必
要であった。このため、スペースが極めて限られた金型
中で、着磁ヨークに刻応的に７１個の励磁コイルを組込
むことは機織構成的に限界かあり、従って１回の射出成
形で金型から多極異方性樹脂磁石の多数個取りをするこ
とは非ツ：（に困難であった。By the way, when manufacturing anisotropic resin magnets by this so-called magnetic field injection molding, conventionally, as shown in Fig. 1,
L-pole magnetizing yokes 12 are arranged in a row on the radial outer periphery of a cavity 10 defined in the mold. It was necessary. For this reason, it is difficult to incorporate 71 excitation coils into the magnetizing yoke from time to time in a mold with extremely limited space. It was difficult to produce a large number of polar anisotropic resin magnets.
本発明は、磁場射出成形により多極異方付樹脂砂Ｘｒ〒
を製造する際に内在している前記難点に鑑み、これを克
服するべく案出されたものであって、金型中のｔ５１数
のキャビティに多極磁界を印加するための着磁ヨークの
配列に工夫を加えることにより、従来着磁ヨークの極数
に対応してｎ個必要とさ」していた励磁コイルの配設数
を低減させ、スペースの限らＡした金型に才ｊける多極
異方性樹脂磁石の多数個取りを実現し、併せて製造コス
トの減少および稼動効率の向上を図ることを目的とする
。The present invention produces multipolar anisotropic resin sand Xr by magnetic field injection molding.
In view of the above-mentioned difficulties inherent in manufacturing a mold, the arrangement of magnetizing yokes was devised to overcome this problem, and the arrangement of magnetizing yokes was devised to apply a multipolar magnetic field to a cavity with a number of t51 in a mold. By adding ingenuity to this, the number of excitation coils that were conventionally required (n) corresponding to the number of poles of the magnetizing yoke has been reduced, and the number of excitation coils has been reduced, making it possible to create a multi-pole structure suitable for molds with limited space. The purpose is to realize the production of multiple anisotropic resin magnets, as well as to reduce manufacturing costs and improve operating efficiency.
前記目的を達成するため本発明に係る磁場射出成形用金
型構造は、金型に４つのキャビティを所定配列で両成し
、隣接し合うキャビティを金型内において磁気的に接続
する２つの共通着磁ヨークおよび−・端部を金型外方に
延出させた２つの独立着磁１−りの各端部を前記各キャ
ビティの内側に夫々所定の位相角で臨ませ、前記共通着
磁ヨークおよび独立着磁ヨークを磁界発生源に接続して
各キャビティに磁場を形成するよう構成したことを特徴
どする。In order to achieve the above object, the mold structure for magnetic field injection molding according to the present invention has four cavities in a mold in a predetermined arrangement, and two common cavities that magnetically connect adjacent cavities within the mold. A magnetizing yoke and two independently magnetized ends each extending outward from the mold are faced inside each of the cavities at a predetermined phase angle, and the common magnetization is carried out. It is characterized in that the yoke and the independently magnetized yoke are connected to a magnetic field generation source to form a magnetic field in each cavity.
この場合、前記磁界発生源は」１１通着磁ヨークから金
型外方へ導出した磁界誘導用ヨークとその両側に位置す
る一対の独立着磁ヨークの夫々に配設した励磁コイルで
構成され、磁界誘導用ヨークに配設された励磁コイルの
巻数は各独立着磁ヨークに配設された励磁コイルの巻数
の２倍に設定してオンけはりＴｉ商である。In this case, the magnetic field generation source is composed of a magnetic field inducing yoke led out from the 11 magnetizing yokes to the outside of the mold, and an excitation coil disposed in each of a pair of independent magnetizing yokes located on both sides of the yoke, The number of turns of the excitation coil disposed on the magnetic field induction yoke is set to twice the number of turns of the excitation coil disposed on each independent magnetization yoke, so that the number of turns of the excitation coil disposed on the magnetic field induction yoke is equal to the Ti quotient.
更に、前記磁界発生源は金型外方に延出している２つの
独立着磁ヨークの夫々に配設した励磁コイルで構成さＪ
すると共にこの励磁コイルで発生した磁界は金型外方へ
導出した磁界誘導用ヨークを介して前記共通、？′ｉ磁
ヨークに分配され、各励磁コイルの巻数比は１：１に設
定されるよう構成しても、同様に好結果か得られる。Furthermore, the magnetic field generation source is composed of excitation coils disposed on each of two independent magnetizing yokes extending outward from the mold.
At the same time, the magnetic field generated by this excitation coil is transmitted to the common ? Even if the excitation coils are distributed over the magnetic yokes and the turns ratio of each excitation coil is set to 1:1, similarly good results can be obtained.
次に、本願の発明に係る磁場射出成形用金型構造に−）
き、好適な実施例を挙げて添付図面を参照しながら以下
許に１１１に説明する。第２図は本発明に係る金型構造
の第１実施例の平面図であって、参照符号１ （３は、
例えはオーステナイ１−系ステンレスの如き非磁性体を
材質とする磁場射出成形用金型を示し、この金型１６の
分割平面内には所定配列で４つのキャビティ１８ａ乃至
１８ｄが画成されている。すなわち本実施例の場合、金
型１６の分割平面に仮想的に設けた正方形の各頂点に夫
々のキャビティ１８が位置するよう設定されて、合計４
つのキャビティが画成されている。Next, regarding the magnetic field injection molding mold structure according to the invention of the present application-)
A preferred embodiment will be described below with reference to the accompanying drawings. FIG. 2 is a plan view of the first embodiment of the mold structure according to the present invention, with reference numeral 1 (3 is
For example, a magnetic field injection molding mold made of a non-magnetic material such as austenite 1-series stainless steel is shown, and four cavities 18a to 18d are defined in a predetermined arrangement within the dividing plane of this mold 16. . That is, in the case of this embodiment, each cavity 18 is set to be located at each vertex of a square virtually provided on the dividing plane of the mold 16, so that there are a total of 4 cavities 18.
two cavities are defined.
前記キャビティ１８は、例えばモータ等の回転電機用ロ
ータを製造するのに適した円筒状に形成されており、各
キャビティ１８の半径方向外周には、強磁性体からなる
着磁ヨーク２０が夫々９０゜の位相角で順次配設されて
いる。すなわち、キャビティ１８当り４つの着磁ヨーク
２０ａ乃至２０ｂがその先端をキャビティ内に臨ませる
と共に、該ヨークの端面がキャビティ内周壁面の一部を
形成するようになっている。そして、各キャビティ１８
に配設した４つの着磁ヨークの内２つの着磁１−り２０
ａおよび２０ｄは、夫々隣接し合うキャビティ１８に各
端部を臨ませかつ金型１６内に位置する共通着磁ヨーク
となり、残りの２つの着磁ヨーク２０ｂおよび２０ｃは
、夫々前記共通着磁ヨーク２０ａおよび２０ｄに対し夫
々２９−０°の位相角て金型１６外方に延出する独立の
着磁ヨークとなっている。例えば、第２図においてキャ
ビティ１８ａについて観察すれは、該キャビティ１８ａ
に一端部を臨ませている着磁ヨーク２０ａは、前記キャ
ビティ１８ａの正方形の一方の辺方向に位置する隣接キ
ャビティ１８ｂにその他端部を臨ませているから共通着
磁ヨークとなっている。同しくキャビティ１８ａに一端
部を臨ませている着磁ヨーク２０ｄも、前記キャビティ
１８ａの正方形の他方の辺方向に位置する隣接キャビテ
ィ１８ｄにその他端部を臨ませているから共通着磁ヨー
クとなっている。そして、キャビティ１８ａにおいて残
りの２つの着磁ヨーク２０ｂおよび２０ｃが、金型Ｉ６
外方に延出している独立着磁ヨークとなることは、先に
述べた通りである。The cavities 18 are formed in a cylindrical shape suitable for manufacturing a rotor for a rotating electric machine such as a motor, and a magnetizing yoke 20 made of a ferromagnetic material is provided on the radial outer periphery of each cavity 18. They are arranged sequentially at a phase angle of °. That is, four magnetizing yokes 20a to 20b per cavity 18 have their tips facing into the cavity, and the end faces of the yokes form part of the inner peripheral wall surface of the cavity. And each cavity 18
Two of the four magnetizing yokes arranged in
a and 20d are common magnetizing yokes located in the mold 16 with respective ends facing the adjacent cavities 18, and the remaining two magnetizing yokes 20b and 20c are the common magnetizing yokes, respectively. They are independent magnetizing yokes that extend outward from the mold 16 at a phase angle of 29-0 degrees with respect to 20a and 20d, respectively. For example, what is observed about the cavity 18a in FIG.
The magnetizing yoke 20a, which has one end facing the cavity 18a, serves as a common magnetizing yoke because its other end faces the adjacent cavity 18b located on one side of the square of the cavity 18a. Similarly, the magnetizing yoke 20d, which has one end facing the cavity 18a, serves as a common magnetizing yoke because its other end faces the adjacent cavity 18d located on the other side of the square of the cavity 18a. ing. Then, in the cavity 18a, the remaining two magnetizing yokes 20b and 20c are attached to the mold I6.
As described above, it becomes an independently magnetized yoke that extends outward.
次に、金型１６内に位置する前記共通着磁ヨーク２０ａ
、２０ｄには、夫々その中央部において磁界誘導用ヨー
ク２２が分岐されて、前記金型１６の外方へ延出してい
る。従って、この磁界誘導用ヨーク２２は、第２図から
判明するように１例えば隣接し合うキャビティ１８ａ、
１８ｄから金型１６の外方ｌ＼夫々延出する各独立着磁
ヨーク２０ｃ。Next, the common magnetizing yoke 20a located inside the mold 16
, 20d, a magnetic field guiding yoke 22 is branched at the center thereof and extends outward from the mold 16. Therefore, as can be seen from FIG.
Each independent magnetizing yoke 20c extends outward from the mold 16 from 18d.
２０ｃの中間に位置していることになる（換言すれば、
磁界誘導用ヨーク２２は、金型１６の外方にあって両側
に各独立着磁ヨーク２０ｃを位置させているものである
）。また金型１６の外方に延出している中間の磁界誘導
用ヨーク２２の他端部は、その両側に位置する−・対の
独立着磁ヨーク２０．２０を直角に折曲して形成した連
結ヨーク２４．２４に夫々接続されて、第２図に示すよ
うに磁気閉ループを形成するようになっている。20c (in other words,
The magnetic field guiding yoke 22 is located outside the mold 16 and has independent magnetizing yokes 20c located on both sides). The other end of the intermediate magnetic field guiding yoke 22 extending outward from the mold 16 is formed by bending a pair of independent magnetizing yokes 20 and 20 located on both sides at right angles. They are connected to connecting yokes 24, 24, respectively, to form a magnetic closed loop as shown in FIG.
このように構成される磁界誘導用ヨーク２２と、独立着
磁ヨーク２０には、各キャビティ１８に磁場を形成する
ために、励磁コイル２６が配設されている。すなわち、
第２図に示す実施例では、励磁コイル２６は中間の磁界
誘導用ヨーク２２およびのその両側に位置する一対の独
立着磁ヨーク２０．２０に夫々配設されるようになって
いる（この場合は、分割巻された励磁コイル２Ｇか各キ
ャビティ当り３個配設され、金型全体では１２個あるこ
とになる）。各励磁コイル２６は、キャビティ１８に有
効な磁場を形成するために、１つの着磁ヨーク２０につ
き少くとも７，０００ガウス以上の起磁力をり、えるも
のであることが要求される。An excitation coil 26 is disposed in the magnetic field induction yoke 22 and the independent magnetization yoke 20 configured as described above in order to form a magnetic field in each cavity 18 . That is,
In the embodiment shown in FIG. 2, the excitation coils 26 are disposed in the intermediate magnetic field induction yoke 22 and a pair of independent magnetization yokes 20, 20 located on both sides of the intermediate yoke 22 (in this case, In this case, three divided excitation coils (2G) are arranged for each cavity, and there are 12 in the entire mold). Each excitation coil 26 is required to have a magnetomotive force of at least 7,000 Gauss or more per magnetizing yoke 20 in order to form an effective magnetic field in the cavity 18 .
しかし磁界誘導用ヨーク２２に配設された励磁コイル２
６が発生する磁界は、共通着磁ヨーク２０ａ（または２
０ｄ）の両端部に分配されるため、独立着磁ヨーク２０
ｃ（または２０ｂ）の励磁コイル２６の起磁力の２倍の
１．４，０００ガウス以上が必要どされる。従って、磁
界誘導用ヨーク２２に配設された励磁コイル２６の巻数
（例えば８００ターン）は、各独立着磁ヨーク２０に配
設された励磁コイル２６の巻数（例えば４００ターン）
の２倍に設定されている。However, the excitation coil 2 disposed on the magnetic field induction yoke 22
The magnetic field generated by the common magnetizing yoke 20a (or 2
0d), so the independent magnetizing yoke 20
A magnetomotive force of 1.4,000 Gauss or more is required, which is twice the magnetomotive force of the excitation coil 26 (or 20b). Therefore, the number of turns (for example, 800 turns) of the excitation coil 26 disposed on the magnetic field induction yoke 22 is the same as the number of turns (for example, 400 turns) of the excitation coil 26 disposed on each independent magnetizing yoke 20.
is set to twice that of .
なお、第３図に本発明に係る磁場射出成形用金型構造の
第２実施例を示す。これは、励磁コイルの配設形態か第
１実施例と相違するだけで、他の構造は全く同しである
。すなわち本実施例では、励磁コイル２６は名独立着磁
ヨーク２０．２０を直角に折曲して形成した連結ヨーク
２４．２／Ｉの夫々に配設されていて、この２つの励磁
コイル２６．２６で発生した磁界を前記磁界誘導用ヨー
クを介して前記共通着磁ヨークに分配するようになっテ
イル。（この場合は、分割巻された励磁コイル２６が各
キャビティ当り２個配設され、金型全体では８個あるこ
とになる）。このとき、各励磁コイル２６は夫々少くと
も１４，０００ガウス以」二の起磁力を発生するものと
し、がっ各コイル巻数比は１：１（例えば１．０００タ
ーンずつ）に設定されている。In addition, FIG. 3 shows a second embodiment of a mold structure for magnetic field injection molding according to the present invention. This differs from the first embodiment only in the arrangement of the excitation coil, and the other structures are completely the same. That is, in this embodiment, the excitation coils 26 are disposed in each of the connecting yokes 24.2/I formed by bending the independent magnetization yokes 20.20 at right angles, and the excitation coils 26. The magnetic field generated at 26 is distributed to the common magnetizing yoke via the magnetic field inducing yoke. (In this case, two divided excitation coils 26 are arranged for each cavity, and there are eight in the entire mold). At this time, each excitation coil 26 shall generate a magnetomotive force of at least 14,000 Gauss or more, and the turns ratio of each coil is set to 1:1 (for example, 1.000 turns each). .
第２図および第３図に示す構成を有する金型の縦断面を
第４図に例示する。すなわち、円筒状キャビティ１８の
開口部上方には、該開口部を開閉自在に閉塞する非磁性
体からなる可動金型２８が昇降自在に配設されている。FIG. 4 illustrates a longitudinal section of a mold having the configuration shown in FIGS. 2 and 3. That is, above the opening of the cylindrical cavity 18, a movable mold 28 made of a non-magnetic material that can freely open and close the opening is disposed so as to be movable up and down.
この可動金型２８がキャビティ１８の開口部に臨む部分
には、キャビティ内方に向けて若干突出する円錐台形状
の***部３０が一体的に形成され、この***部３ｏに後
述する溶融混合物射出用のピンポインＩ・ゲート；（２
が垂直に穿設されている。また、可動金型２８のに方に
は非磁性体からなる更に別の可動金型３４が昇降自在に
配設され、可動金型２８の頂部および可動金型３４の合
わ廿境界面には、図示の如くランナ３６が形成されると
共に、このランナ３６は可動金型３４に穿設したスプル
ー３８およびノズル口４０に連通接続している。なお、
各金型２８および３４を構成する非磁性体としては、例
えばオーステナイト系ステンレスが好適に使用される。A raised part 30 in the shape of a truncated cone that slightly projects inward of the cavity is integrally formed in a portion of the movable mold 28 facing the opening of the cavity 18, and a molten mixture injection described later is formed on this raised part 3o. Pinpoint I gate for (2
are drilled vertically. Furthermore, another movable mold 34 made of a non-magnetic material is disposed on the side of the movable mold 28 so as to be able to move up and down. As shown in the figure, a runner 36 is formed, and this runner 36 is connected to a sprue 38 and a nozzle opening 40 formed in the movable mold 34. In addition,
As the non-magnetic material constituting each mold 28 and 34, for example, austenitic stainless steel is preferably used.
また円筒状キャビティ１８の底部４２を形成する金型１
６には、その底部中央において、後述する如くロータ回
転軸４４を挿通するための貫通孔４６が垂直に穿設され
ている。この場合１貫通孔４６の内径は回転軸４４の外
径に対し２／１００乃至３／１００程度の環状細隙が形
成されるよう予め寸法設定してあり、更に貫通孔４６の
略中間から下方には大径の段イ」孔部４８が一体的に形
成しである。The mold 1 also forms the bottom part 42 of the cylindrical cavity 18.
A through hole 46 for inserting a rotor rotation shaft 44 therethrough is perpendicularly bored in the center of the bottom of the rotor 6 as described later. In this case, the inner diameter of the first through hole 46 is set in advance so that an annular slit of about 2/100 to 3/100 of the outer diameter of the rotating shaft 44 is formed, and furthermore, from approximately the middle of the through hole 46 downward A large-diameter stepped hole portion 48 is integrally formed in the bottom.
これは射出成形後にロータを脱型するに際し、回転軸４
４が貫通孔４６内壁に接触する摩擦抵抗を軽減させるた
めである。また、前記中心貫通孔４６の周囲に隣接して
複数の貫通孔５０が穿設され（第５図）、この貫通孔５
０にノックアウトピン５２が昇降自在に挿通され、キャ
ビティ１８中に突出可能となっている。This is done when removing the rotor from the mold after injection molding.
This is to reduce the frictional resistance caused by contact between the inner wall of the through hole 46 and the inner wall of the through hole 46. Further, a plurality of through holes 50 are bored adjacent to the periphery of the central through hole 46 (FIG. 5).
A knockout pin 52 is inserted through the hole 0 so as to be able to move up and down, and can protrude into the cavity 18.
なお、中心貫通孔４６の外部開放端には、当板５４を着
脱自在に位置させ、この当板５４により回転軸４４のキ
ャビティ中での位置規制をさせるのが好ましい。Note that it is preferable that a stop plate 54 is removably positioned at the externally open end of the central through hole 46, and that the position of the rotary shaft 44 in the cavity is regulated by the stop plate 54.
本発明に係る磁場射出成形用金型構造は、このように構
成したから、第１実施例および第２実施例の何れの場合
も励磁コイル２６を付勢して磁界を励起してやれば、該
磁界は各閉ループを介して着磁ヨーク２０ａ乃至２０ｄ
に誘導され、該ヨーク先端を臨ませたキャビティ１８に
有効磁場が形成される。Since the magnetic field injection molding mold structure according to the present invention is configured as described above, in both the first embodiment and the second embodiment, if the excitation coil 26 is energized to excite the magnetic field, the magnetic field are the magnetizing yokes 20a to 20d via each closed loop.
, and an effective magnetic field is formed in the cavity 18 facing the tip of the yoke.
そこで、本発明に係る金型構造を使用して回転電機用磁
石ロータを製造する場合につき次間する。Therefore, the following is a description of the case where a magnetic rotor for a rotating electric machine is manufactured using the mold structure according to the present invention.
先ず、第４図に示す如く円筒状キャビティ１８の底部に
穿設した貫通孔４６中に回転軸４４を挿通して、該回転
軸４４の軸心をキャビティ１８の軸心と一致させる。こ
の場合、中心貫通孔４６の下部開口を当板５４により閉
塞することにより、回転軸４４の端部はこの当板５４に
当接して所定位置規制がなされ、従って回転軸４４は常
に所定寸法長だけ該キャビティ１８中に臨むようセット
されることになる。First, as shown in FIG. 4, the rotating shaft 44 is inserted into the through hole 46 formed at the bottom of the cylindrical cavity 18, and the axis of the rotating shaft 44 is aligned with the axis of the cavity 18. In this case, by closing the lower opening of the center through hole 46 with the contact plate 54, the end of the rotating shaft 44 comes into contact with the contact plate 54 and is regulated in a predetermined position, so that the rotating shaft 44 always has a predetermined length. It is set so that it faces into the cavity 18.
次いで、磁気異方性定数の大きい強磁性粉末と合成樹脂
とからなる混合物を加熱溶融し、この溶融混合物を前記
可動金型３４のノズル口４０から注入し、スプルー３６
およびピンポイントゲート３２を介して円筒状キャビテ
ィ１８中に射出する。Next, a mixture consisting of a ferromagnetic powder with a large magnetic anisotropy constant and a synthetic resin is heated and melted, and this molten mixture is injected from the nozzle port 40 of the movable mold 34 and then passed through the sprue 36.
and inject into the cylindrical cavity 18 through the pinpoint gate 32.
また、これと同期して前述の如く励磁コイル２６を付勢
し、前記着磁ヨーク２０ａ乃至２０ｄを介してキャビテ
ィ１８に半径方向外方から強磁界を印加する。このよう
に磁石粉末と合成樹脂との混合物が溶融状態にあり、粉
子配列が固まっていない間に複数極の磁界が印加される
ことにより、粉末粉−ｆの磁化容易軸は磁化方向に配向
され、磁気特性の１６れた多（耐異方性樹脂磁石（本実
施例の場合、回転？１１機用の円筒形磁石ロータ）が得
られる。In addition, in synchronization with this, the excitation coil 26 is energized as described above, and a strong magnetic field is applied from the outside in the radial direction to the cavity 18 via the magnetizing yokes 20a to 20d. In this way, when the mixture of magnet powder and synthetic resin is in a molten state and a multi-pole magnetic field is applied while the powder arrangement is not solidified, the axis of easy magnetization of powder powder -f is oriented in the magnetization direction. As a result, an anisotropy-resistant resin magnet (in the case of this example, a cylindrical magnet rotor for a rotary machine with 11 rotations) with magnetic properties of 16 is obtained.
このように本発明に係る金型構造によれば、着磁ヨ−り
の配列を工夫したことにより、従来は着磁ヨークの極数
Ｘキャビティ数だけ必要としていた励磁コイルの数を低
減させることできる。As described above, according to the mold structure according to the present invention, by devising the arrangement of the magnetizing yokes, the number of excitation coils, which was conventionally required by the number of poles of the magnetizing yoke x the number of cavities, can be reduced. can.
すなわち、異方性樹脂磁石の４個取りに際し本来１６個
必要であった励磁コイルの数を、第１実施例の場合は１
２個に、また第２実施例では８個に低減させることがで
き，限られた金型スペース内で各キャビティに容易に多
極磁界を印加して、多極異方化された樹脂磁石の４個取
りを実現し、併せて製造コストの減少と稼動効率の向上
を達成し得る等、多くの有益な効果を奏するものである
。In other words, the number of excitation coils that was originally required to be 16 when producing four anisotropic resin magnets was reduced to 1 in the case of the first embodiment.
The number can be reduced to two, or to eight in the second embodiment, and a multipolar magnetic field can be easily applied to each cavity within a limited mold space to create a multipolar anisotropic resin magnet. This has many beneficial effects, such as realizing four-piece molding, reducing manufacturing costs, and improving operating efficiency.
第１図は従来技術に係る磁場射出成形用金型により異方
性樹脂磁石を製造する際の着磁ヨークと励磁コイルとの
配設例を示す概略説明図、第２図は本発明に係る磁場射
出成形用金型構造の第１実施例の平面図、第３図は本発
明に係る金型構造の第２実施例の平面図、第４図は本発
明に係る磁場射出成形用金型構造の好適実施例の縦断面
図、第５図は第４図のΔ−Ａ線横線面断面図る。
１６・・・・金型 ］８・・・・キャビティ２
０ａ、２０ｄ・・・・共通着磁ヨーク２０ｂ、２０ｃ・
・・独立着磁ヨーク
２２・・・磁界誘導用ヨーク
２６・・・・励磁コイル
特許出願人 大同特殊鋼株式会社FIG. 1 is a schematic explanatory diagram showing an example of the arrangement of a magnetizing yoke and an excitation coil when manufacturing an anisotropic resin magnet using a magnetic field injection mold according to the prior art, and FIG. FIG. 3 is a plan view of the first embodiment of the injection mold structure, FIG. 3 is a plan view of the second embodiment of the mold structure according to the present invention, and FIG. 4 is the magnetic field injection mold structure according to the present invention. FIG. 5 is a longitudinal cross-sectional view of a preferred embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line Δ-A in FIG. 16... Mold] 8... Cavity 2
0a, 20d... Common magnetizing yoke 20b, 20c.
...Independent magnetizing yoke 22...Yoke 26 for magnetic field induction...Excitation coil patent applicant Daido Steel Co., Ltd.
Claims (3)
接し合うキャビティを金型内において磁気的に接続する
２つの共通着磁ヨークおよび一端部を金型外方に延出さ
せた２つの独立着磁ヨークの各端部を前記各キャビティ
の内側に夫々所定の位相角で臨ませ、１）ｉ記共通着磁
ヨークおよび独立着磁ヨークを磁界発生源に接続して各
キャビティに磁場を形成するよう構成したことを特徴と
する磁場射出成形用金型構造。(1) All molds have four cavities defined in a predetermined arrangement, two common magnetizing yokes that magnetically connect adjacent cavities within the mold, and one end extending outside the mold. Each end of the two independent magnetizing yokes faces the inside of each cavity at a predetermined phase angle, and 1) the common magnetizing yokes and the independent magnetizing yokes described in i are connected to a magnetic field generation source to form each cavity. A mold structure for magnetic field injection molding, characterized in that it is configured to generate a magnetic field.
導出した磁界誘導用ヨークとその両側に位置する一対の
独立着磁ヨークの夫々に配設した励磁コイルで構成され
、磁界誘導用ヨークに配設された励磁コイルの巻数は各
独立着磁ヨークに配設された励磁コイルの巻数の２倍に
設定されている特許請求の範囲第１項記載の磁場射出成
形用金型構造。(2) The magnetic field generation source is composed of a magnetic field inducing yoke led out of the mold from a common magnetization source, and an excitation coil disposed in each of a pair of independent magnetization yokes located on both sides of the yoke, The magnetic field injection molding metal according to claim 1, wherein the number of turns of the excitation coil disposed on the magnetic field induction yoke is set to twice the number of turns of the excitation coil disposed on each independent magnetization yoke. Type structure.
独立着磁ヨークの夫々に配設した励磁コイルで構成され
ると共にこの励磁コイルで発生した磁界は金型外方へ導
出した磁界誘導用ヨークを介して前記共通着磁ヨークに
分配され、各励磁コイルの巻数比は１：１に設定されて
いる特許請求の範囲第１項記載の磁場射出成形用金型構
造。(3) The magnetic field generation source is composed of excitation coils disposed on each of two independent magnetizing yokes extending outside the mold, and the magnetic field generated by the excitation coils is led out to the outside of the mold. 2. The mold structure for magnetic field injection molding according to claim 1, wherein the excitation coils are distributed to the common magnetizing yoke via the magnetic field induction yoke, and the turn ratio of each excitation coil is set to 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202183A JPS59168620A (en) | 1983-03-14 | 1983-03-14 | Die structure for injection molding in magnetic-field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202183A JPS59168620A (en) | 1983-03-14 | 1983-03-14 | Die structure for injection molding in magnetic-field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59168620A true JPS59168620A (en) | 1984-09-22 |
| JPH0220131B2 JPH0220131B2 (en) | 1990-05-08 |
Family
ID=12624512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4202183A Granted JPS59168620A (en) | 1983-03-14 | 1983-03-14 | Die structure for injection molding in magnetic-field |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59168620A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634606A (en) * | 1986-06-25 | 1988-01-09 | Denki Kagaku Kogyo Kk | Die and method for performing injection molding and multipolar magnetization simultaneously |
-
1983
- 1983-03-14 JP JP4202183A patent/JPS59168620A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634606A (en) * | 1986-06-25 | 1988-01-09 | Denki Kagaku Kogyo Kk | Die and method for performing injection molding and multipolar magnetization simultaneously |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0220131B2 (en) | 1990-05-08 |
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